CN1490660A - Gain controlling method for reversed distributed multipumping Raman amplifier - Google Patents

Gain controlling method for reversed distributed multipumping Raman amplifier Download PDF

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CN1490660A
CN1490660A CNA021375615A CN02137561A CN1490660A CN 1490660 A CN1490660 A CN 1490660A CN A021375615 A CNA021375615 A CN A021375615A CN 02137561 A CN02137561 A CN 02137561A CN 1490660 A CN1490660 A CN 1490660A
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gain
power
pump laser
value
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CN1317599C (en
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王加莹
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ZTE Corp
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Abstract

The method is as the follows. First, pumping power distribution value requiring gain is calculated according to gain requlation command, driving circuit of pumping laser is controlled by control unit processor according to new pumping power distributino value in order that the pumping laser can output the desired light power; then detection signal light power is compared with reference power to calculate current gain value; To compare gain valuve with gain disposal value for obtaining revised power distribution value of the pumping laser through recalculation according to its difference value and finally the pumping laser drive circuit is controlled by the control unit processor to enable the pumping laser to output the desired light power.

Description

The gain adjusting method therefore of the reversed distributed raman amplifier of many pumpings
Technical field
The present invention relates to dense wave division multipurpose (DWDM) optical communication equipment in the optical communication field, specifically, relate to wherein about Raman (Raman) Amplifier Gain control method.
Background technology
In dense wavelength division multiplexing system, in order to extend transmission distance, need to use the image intensifer device, wherein a kind of is the Raman amplifier, it is with in the powerful pump light feed-in optical fiber, utilize the stimulated Raman Scattering effect (SRS effect) in the optical fiber, make pump energy transfer to, realize the amplification of flashlight than in the longer flashlight of its wavelength.If directly use Transmission Fibers as amplifying medium, then this Raman amplifier is exactly distributed Raman amplifier.The reach broad of Raman amplifier is fit to Wave division multiplexing optical transmission system.Select suitable pumping wavelength, can make the optimum gain of Raman amplifier appear at the operating wave strong point.Because the centre wavelength difference of each optical channel, under certain channel spacing situation, optical channel quantity is many more, and the bandwidth that takies is wide more.Because the gain spectral unevenness of the SRS effect of single wavelength pump light, so the pump light acting in conjunction of generally using a plurality of wavelength is in the wavelength coverage of signal work, to realize that the signal in the broad wavelength region may amplifies, the effect that guarantees whole channels acquisition amplifications is close, promptly satisfies the flatness requirement of gain spectral.
The gain spectral of pump laser is relevant with its output power, changes the output power of each wavelength pump laser, and the gain spectral that is obtained also can change.Under the average gain condition of determining, best gain spectrum flattening is corresponding to fixed pump Pu power division ratio.
The gain spectral of pump laser is also relevant with the type of optical fiber, and different optical fiber has SRS effect in various degree, the signal gain difference that causes identical pumping output power to obtain in different optical fiber.
When in dwdm system, using reversed distributed Raman amplifier, be that pump light and the flashlight direction of propagation in optical fiber is opposite, can regulate the output power of each pumping, up to obtain to meet the signal light power of application need and the flat gain of each channel in this locality.
Because enlarge-effect produces in Transmission Fibers, though respectively signal power is detected the turn off gain that can obtain amplifier at pumping open and close state, but during the reversed distributed Raman amplifier of online use, local node directly the turn off gain of pair amplifier detect in real time, because turn-off pumping the signal light power that is transmitted will be lost, can cause service disconnection, this disposes or regulates and brought difficulty for the online Amplifier Gain of carrying out.Finally can obtain to meet the signal light power of application need and the flat gain of each channel though relatively regulate the output power of each pumping, but this need detect signal spectrum in this locality, also need plant maintenance personnel pair amplifier to regulate repeatedly, the difficulty of plant maintenance and debugging is higher.
U.S. Pat 6417959 Raman fiber amplifier and Chinese patent CN1334484 raman amplifier all disclose a kind of Raman amplifier that uses many pump lasers to form, the optics of the main Raman of description amplifier is formed, though also having mentioned control device controls pump laser, so that real-time regulated gain spectral, but formation of undeclared control device all, can not control pump laser by the real-time Communication for Power mode, to reach the purpose that gain spectral is regulated.
European patent EP 1182808 Optical amplifier with pump light source control forraman amplification have announced a kind of control method of RAMAN amplifier pumping luminous power, it is foundation that this method adopts the multiple signals relevant with performance number with the pump light number of wavelengths to detect, data source and parsing means obtain pump laser power division value by experiment, and then the control of realization power, its gain control method more complicated.
U.S. Pat 64 17965 Optical amplifier control system have announced a kind of control system of image intensifer, image intensifer input, output light are carried out beam split detect, and according to testing result the pump laser of image intensifer are controlled.This invention comprises that has the image intensifer that input and output light detects, AD converter and a controller of input, output detection signal, this system only is the yield value of control image intensifer, does not regulate the gain of image intensifer, also is not suitable for similar reversed distributed Raman amplifier.
In sum, there is not to find to have disclosed document to put down in writing the apparatus and method that the average gradient to many pumps spectrum Raman amplifier gain spectrums carries out online adjusting.
Summary of the invention
Technical matters to be solved by this invention is to propose the reversed distributed Raman Amplifier Gain of a kind of many pumpings control method, it is difficult to overcome many pumpings Raman amplifier Configuration Online and regulate gain, and artificial online adjusting is easy to change flat gain, problem that adjustment process is loaded down with trivial details.
Gain adjusting method therefore of the present invention may further comprise the steps:
The first step, according to correlation parameter in the gain-adjusted order or default configuration data, calculate the pump power apportioning cost of institute under requiring to gain;
Second step, according to new pump power apportioning cost, the driving circuit of control module processor control pump laser makes the luminous power of pump laser output expectation;
The 3rd step, detection signal light, and compare with reference power, as current yield value;
The 4th goes on foot, the 3rd step gained yield value and gain Configuration Values is compared, and calculates once more according to its difference, obtains revised pump laser power division value;
The 5th step, according to the revised pump laser power division value of the 4th step gained, by the driving circuit of control module processor control pump laser, make the luminous power of pump laser output expectation.
Gain adjusting method therefore of the present invention compared with prior art, obtained the progress of Raman amplifier application controls mode in the optical communication equipment, reached effect by communication instruction directly disposes and resonance-amplifier gains, and when change in gain, realize the flat gain constraint automatically, in the gain-adjusted process, can not cause service disconnection, meet online equipment operating and maintenance requirements.Can implement gain-adjusted by online pair amplifier when using the reversed distributed Raman amplifier of many pumping wavelengths, implement the gain-adjusted process and try one's best and damage flat gain littlely.
Description of drawings
Fig. 1 is the synoptic diagram of reversed distributed Raman amplifier of many pumpings and regulating device thereof.
Fig. 2 is the process flow diagram of gain adjusting method therefore of the present invention.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail:
As shown in Figure 1, the reverse Raman amplifier of many pumpings comprises pump laser group, wave multiplexer and ratio coupling mechanism.The luminous power of pump laser group output is through exporting by optical interface Ci behind the wave multiplexer, flashlight after the amplification is exported from wave multiplexer W, in the inboard of flashlight output optical interface Co, usage ratio coupling mechanism acquired signal luminous power obtains the detection limit s-mon of output signal luminous power.The pump laser group is by N laser constitution, all N laser instrument by electrical interface JP1, JP2 ..., JPN links to each other with gain adjustment device; The pump laser group can be exported the laser emission that meets the demands when operate as normal.Wave multiplexer constitutes the pump light path between port one and port 3, then constitute the flashlight path between port 2 and port 3, and pump light is by port one input, port 3 outputs; Flashlight by port 3 inputs, port 2 outputs, is the amplifier of applied in reverse then.There is pump light p in port one, and there is flashlight s in port 2, and there is the mixed light p+s of pumping and signal in 3 of ports.Ci is an optical interface, generally is the pluggable movable joints of optical fibre, and pumping light power outputs to the optical fiber that the amplifier outside is connected by this interface, the light signal that is exaggerated then from then on interface enter in the amplifier.The beam split ratio of ratio coupling mechanism is x: y, and promptly the luminous power by the port one input is p_s[mw], then there is p_s*y/ (x+y) [mw] to output to port 2, there is p_s*x/ (x+y) [mw] to output to port 3; In order to reduce the influence of coupling mechanism to Output optical power, should select x＜＜y.The light of port 3 outputs is as the detection limit s-mon of output signal luminous power, and the light signal after is exported from optical interface Co after testing.
In gain adjustment device, comprise photoelectric commutator, amplifier A, A/D convertor circuit, control module processor, AD/DA change-over circuit and amplifier group (1a, 1b ... Na, Nb).Photoelectric commutator generally adopts photo-detector diode, and the detection limit s-mon of output signal luminous power is carried out opto-electronic conversion, forms analog electrical signal.Be input to then among the amplifier A, carry out the AD conversion,, and will be worth average power as light signal with the detected value of digital signaling in D1 mouth picked up signal output power through exporting A/D convertor circuit after suitably amplifying to.Amplifier A should select low-frequency amplifier, and A/D convertor circuit should be selected the AD converter part of low rate.
AD/DA change-over circuit and amplifier group (1a ..., Nb) mainly finish control of the power of pump laser and Performance Detection, the management of controlled Cell processor.The control module processor is communicated by letter with the AD/DA change-over circuit by data line D2.The amplifier group links to each other with N laser instrument of pump laser group respectively by pump laser interface JP1, JP2, JPN.JP1 is the electrical interface of controlled pump laser 1, and the user that the commercial lasers device is abideed by in the application of pump laser interface uses data.With JP1 is example, and I represents the laser works electric current, and O represents the output of laser instrument backlight power detection signal.The AD/DA change-over circuit should be selected according to the quantity of laser instrument, the number of parameters that detects and control, to realize that multichannel detects and control.
The control module processor constitutes a minimum control system by CPU and periphery ROM thereof, RAM, sequential logical circuit, input/output interface, and each links to each other with control line (D-ROM, D-RAM, D-FPGA) by data line between forming.A/D convertor circuit is input to the CPU from the digital signal of D1 mouth output, in order to the current gain of computing amplifier.The software that moves in CPU judges that according to current gain value, configuration yield value the pump laser that needs is carried out gain-adjusted gains and flat gain control automatically.
CPU can also link to each other with the communication bus of equipment by input/output interface, makes the work state information of amplifier be reported to equipment management system by communication bus, and the control of accepting device management system.When needs are regulated gain, equipment management system can send instruction to gain adjustment device through input/output interface, gain requirement and current testing result according to instruction behind the CPU recognition instruction are judged, when judgement needs to regulate, again the duty of laser instrument is regulated.
ROM is as program storage, but the executive software that in store gain adjustment device is moved can be introduced among the CPU and move; RAM is as data-carrier store, the significant data that is recorded in the program run to be produced.Sequential logical circuit is used to form work schedule, other devices of gating.
When needs detection signal luminous power s-mon, the CS1 signal of CPU control timing logical circuit is to select the input port of A/D convertor circuit, and A/D convertor circuit passes through the D1 mouth to the CPU output data simultaneously; When needs are controlled the output power of pump lasers (as pump laser 1), the CS2 signal of CPU control timing logical circuit is selected the output port of AD/DA change-over circuit, CPU passes through the D2 mouth to AD/DA change-over circuit output data simultaneously, the port of selecting by sequential logical circuit through DA conversion back obtains the analog operation electric current, again through delivering to the control end I of interface JP1 behind the amplifier 1a; When needs detect the output power of pump laser 1, CPU control timing logical circuit is selected the input port of AD/DA change-over circuit, be input to the AD/DA change-over circuit behind the signal process amplifier 1b of interface JP1 test side O output, realize outputing to CPU through the D2 mouth after the AD conversion.In addition, can also other Performance Detection end that commercial pump laser electrical interface provides be detected, as laser instrument refrigeration electric current, laser tube core temperature etc.
Introduce the ultimate principle of the inventive method below in detail.
Down, CPU can deposit the control of laser instrument and Performance Detection data among the RAM in,, can inquire about by the devices communicating bus to make things convenient for equipment control as performance data in working order.Performance data is as shown in table 1.
The performance data of table 1 laser instrument
Laser instrument
1 Laser instrument 2 …… Laser instrument N
Back facet current f 1 ????f 11 ????f 12 …… f 1N
Refrigeration electric current f 2 ????f 21 ????f 22 …… f 2N
Die temperature f 3 ????f 31 ????f 32 …… f 3N
Working current f 4 ????f 41 ????f 42 …… f 4N
????…… ????…… ????…… …… ……
F wherein iBe the performance classification of pump laser, f IjIt is the i individual character energy of j pump laser.
In the present invention, except the performance of pump laser, also have two important performances, one is signal light power, represents with p_s; One is the turn off gain of the current realization of amplifier, represents with G_s.
When realizing gain control, the distribution ratio regular meeting of the output power of each pump laser influences the flat gain in the bandwidth of signal place, even guarantee the allocation proportion of the output power of each pump laser, at gain mean value not simultaneously, flat gain also may be different.As master data, need to deposit in the corresponding relation of gain and pump power distribution among the RAM.Corresponding to the optical fiber of particular types, satisfy needed working gain of system and flat gain requirement, the output power of each pump laser is as can be known.To the commercial lasers device of particular brand and specification, its output power value and its bias current have corresponding relation.The power division value of each pump laser is stored among the RAM as gain one pump power relation data, sees Table 2, implement control so that CPU abides by these data.
Table 2 gain-pump power relation data
Turn off gain Laser instrument 1 power Laser instrument 2 power …… Laser instrument N power
????G 1 ????P 11 ????P 12 …… ??P 1N
????G 2 ????P 21 ????P 22 …… ??P 2N
????G 3 ????P 31 ????P 32 …… ??P 3N
????G 4 ????P 41 ????P 42 …… ??P 4N
???…… ????…… ????…… …… ??……
Wherein, G iBe the one group of discrete gain values that covers amplifier switch gain working range, P IjBe corresponding to turn off gain G iThe time, the pump laser j of realization optimum gain flatness (j=1 ..., output power N).Generally speaking, do not need too much discrete gain numerical value,, suppose that its normal range of operation in the line requires at 10dB ± 2dB, then in 5 groups of discrete values of the following needs of the situation of every interval 1dB as the amplifier that a nominal gain is 10dB.The interval is more little, coverage is big more, and then discrete values is many more, visual actual demand decision.The tables of data that table 2 is listed is the significant data that this method realizes the flat gain assurance, and these data can be kept in the storer in advance, also can be written into storer by communication mode down in working order.
To dissimilar optical fiber, realize that optimum pump power distributes difference under the identical gain situation, can test dissimilar optical fiber in advance, obtain the pairing data of table 2, as the default configuration data of amplifier work.
If the system of amplifier practical application, Transmission Fibers is comparatively special, also can carry out engineering test to this optical fiber, obtains the pairing data of table 2, is written in the storer by communication mode after this device works on power, and uses in order under the on-line maintenance situation.
The requirement of pair amplifier work at present state is represented with suitable configuration amount, can be described as amplifier " configuration data ", also is kept among the ROM, and these state configuration amounts comprise:
P0_s: the output power signal (do not contain noise) of expression when having only 1 optical channel, under the pump laser shutoff situation, carry out the reference value of gain-adjusted as this device.Reference value is and the irrelevant amount of amplifier that the engineering design according to circuit before equipment is opened operation is determined.
N_ch: the optical channel number under the expression duty.When considering equipment work the optical channel number of variations may take place, the present invention can not the Direct-detection Optical number of active lanes, can obtain optical channel number accurately by configuration order.
G_c: expression gain Configuration Values, the turn off gain that promptly requires amplifier to realize.
P_n: under this device normal operation,, can be used as configuration data and obtain, be used for revising current gain testing result by communication bus with the common noise light power that exists of signal light power.When it is 0, broadband spontaneous emission noise and shot noise influence when then Photoelectric Detection has been ignored in expression.
TYPE: expression circuit optical fiber type indication, for example " 0 " expression G.652, G.655, " 1 " expression waits, under the situation to Configuration Online gain-pump power relation data, also available special character is represented, so that correct gain-pump power relation database table is used in CPU identification back when gain-adjusted.
More than each configuration data can be kept in advance in the storer, also can be in working order be written into storer by communication mode down.
Pass between amplifier output signal power p_s and the detection power s-mon is:
p_s[dBm]＝s-mon[dBm]+10lg(1+y/x)[dB]?(x＜＜y)?????????????????(1)
The relation of the current gain G _ s of amplifier and input power and configuration data is:
G_s[dB]＝101g(10 p_s[dBm]/10-10 p_n[dBm]/10)-10lgN_ch-p0_s[dB]??????(2.1)
=p_s[dBm]-10lgN_ch-p0_s[dB] when p_n is left in the basket (2.2) in the data of table 2 correspondence, if there is a G m, G n, satisfy
G m＜G_c＜G n(3) G wherein m, G nBe the discrete gain values nearest apart from G_c, then corresponding to gain Configuration Values G_c, the pump laser power division of optimization is:
P_c j=P Mj+ (G_c-G m) * (P Nj-P Mj)/(G n-G m) (4) P_c wherein jFor pump laser j (j=1 ..., best configuration output power N), G_c is the gain Configuration Values, all the other parameters are taken from table 2.Attention: corresponding different TYPE, table 2 has different data.
When according to P_c jAfter pairing pump laser working current was controlled pump laser, the gain of realization was G_s, if
| G_s-G_c|＜Δ (5) then satisfies the degree of regulation requirement, and wherein Δ is a gain-adjusted error allowance value.
If do not satisfy formula (5), then need to implement automatically 2 calibrations.Get
In gain Configuration Values G_c ' the substitution formula (4) after G_c '=2G_c-G_s (6) will upgrade, can obtain one group of new laser power Configuration Values, control again; Also can implement automatically repeatedly to calibrate, up to the requirement of satisfying formula (5).
After amplifier powers on, CPU will inquire about the state configuration data among the ROM, and gain is according to the rules controlled pump laser; After control is finished, current performance data is deposited among the RAM, inquire about by communication bus in order to the apparatus manager.When working online, can realize the gain configuration and the adjusting of pair amplifier by change state configuration data.
Gain adjustment device of the present invention also can carry out communication with equipment management system, the following describes relevant devices communicating type.
Equipment management system can be implemented following inquiry by communication bus: performance information inquiry (corresponding message 1) and configuration information inquiry (corresponding message 2); Gain adjustment device is exported following message by input/output interface to communication bus: performance information reports (corresponding message 3) and configuration information to report (corresponding message 4).Equipment management system is implemented following control by communication bus: configuration data upgrades (corresponding message 5).
Provide the embodiment of above-mentioned message 1～5 below respectively.
Message 1:[H, ADD, C1, L, F]---wherein H represents heading, is the set form train of impulses of realizing communication synchronization; ADD represents the address mark of gain adjustment device in equipment; C1 is the communication protocol coding, represents performance queries here; L represents message length; F represents the performance number classification of inquiring about to comprise current output power signal p_s, turn off gain value G_s, pump laser serviceability data f iDeng.
Message 2:[H, ADD, C2, L, C]---identical in implication and the message 1 of H, ADD and L wherein; C2 is the communication protocol coding, here is the configuration information inquiry; C represents the configuration data classification of inquiring about, and comprises that gain-adjusted reference value p0_s, work optical channel number N _ ch, turn off gain Configuration Values G_c, the gain of current configuration detects modified value p_n, fiber type indication TYPE, gain-pump power relation database table p IjDeng.
Be the inquiry of back message using 1, gain adjustment device is by the message of input/output interface to the following form of device bus output.
Message 3:[H, ADD, C3, L, F, V1, V2 ..., Vn]---implication and message 1 identical of H, ADD and L wherein; C3 is a protocol code, represents that here performance number reports; F represents the performance number classification of inquiring about, comprise gain adjustment device current output power signal p_s, turn off gain value G_s, pump laser serviceability data f iDeng, V1, V2 ..., Vn represents n performance number reporting.
Be the inquiry of back message using 2, gain adjustment device is by the message of input/output interface to the following form of device bus output.
Message 4:[H, ADD, C4, L, C, V1, V2 ..., Vn]---identical in implication and the message 1 of H, ADD and L wherein; C4 is a protocol code, represents that here configuration information reports; C represents the configuration data classification of inquiring about, and comprises that gain-adjusted reference value p0_s, work optical channel number N _ ch, turn off gain Configuration Values G_c, the gain of the current configuration of gain adjustment device detects modified value p_n, fiber type indication TYPE, gain-pump power relation database table etc.; V1, V2 ..., Vn represents n configuration information value reporting.
When equipment management system is implemented the configuration data renewal to gain adjustment device, send the message of following form by device bus.
Message 5:[H, ADD, C5, L, C, V1, V2 ..., Vn]---implication and message 1 identical of H, ADD and L wherein; C5 is a protocol code, here represents gain adjustment device is configured Data Update; C represents the configuration data classification of inquiring about, and comprises that gain-adjusted reference value p0_s, work optical channel number N _ ch, turn off gain Configuration Values G_c, the gain of the current configuration of gain adjustment device detects modified value p_n, fiber type indication TYPE, gain-pump power relation database table etc.; V1, V2 ..., Vn represents n configuration information value upgrading.
The present invention realizes the automatic flow process of controlling of luminous power as shown in Figure 5.
Step 1: during the gain adjustment device powerup/reset, the control module processor starts, and loads executable program in ROM.
Step 2: read the configured list among the ROM, obtain gain-adjusted reference value p0_s, work optical channel number N _ ch, turn off gain Configuration Values G_c, gain detection modified value p_n, fiber type TYPE and gain-pump power relation data P Ij, and with among the above-mentioned data importing RAM; If configured list is empty, then use the default value of above-mentioned each amount.
Step 3: control module processor control amplifier group and AD/DA change-over circuit are implemented flashlight detection, pump laser state-detection, obtain pump laser serviceability data f Ij, and obtain current demand signal output power p_s and current turn off gain G_s according to formula (1) and (2).
Step 4: judge whether gain adjustment device is newly started shooting/resetted, or have configuration data to upgrade, if then enter step 5; If not, then enter step 9.
Step 5: according to formula (3), (4), according to configuration data and gain-pump laser power data, calculating optimum configuration output power P_c j
Step 6:CPU is by AD/DA change-over circuit and amplifier group, according to P_c jCorresponding laser works electric current is regulated each pump laser output power.
Step 7: control module processor control amplifier A and A/D convertor circuit are implemented flashlight and are detected, and obtain current output power signal p_s and current turn off gain G_s.
Step 8: judge according to formula 5 whether regulate the result satisfies the departure requirement, if then enter step 9; If not, then enter step 11.
Step 9: the order storehouse relevant in the inquiry control module processor with input/output interface, when being empty, there is not the message of reception as if Query Result, then enter step 3, implement the cycle performance detection; If the reception message is arranged, then enter step 10.
Step 10: carry out message and handle,, then report (message 3) according to performance information if the order storehouse has performance information inquiring command (message 1); If the order storehouse has configuration information querying command (message 2), then report (message 4) according to configuration information; If the order storehouse has configuration data update command (message 5), then revise the configured list among the RAM, or important configuration data is kept at E 2Among the PROM; Enter step 3 then, continue to implement cycle performance and detect.
Step 11:, enter step 5 again according to gain Configuration Values calibration of formula (6).
Comprise a coarse adjustment and primary calibration in the above step, finish automatically, in said method, do not get rid of repeatedly and calibrate, till reaching satisfactory output power by gain adjustment device.

Claims (5)

1, the gain adjusting method therefore of the reversed distributed raman amplifier of a kind of many pumpings is characterized in that, may further comprise the steps:
The first step, according to correlation parameter in the gain-adjusted order or default configuration data, calculate the pump power apportioning cost of institute under requiring to gain;
Second step, according to new pump power apportioning cost, the driving circuit of control module processor control pump laser makes the luminous power of pump laser output expectation;
The 3rd step, detect current demand signal light, and compare, as current yield value with reference power;
The 4th goes on foot, the 3rd step gained yield value and gain Configuration Values is compared, and calculates once more according to its difference, obtains revised pump laser power division value;
The 5th step, according to the revised pump laser power division value of the 4th step gained, by the driving circuit of control module processor control pump laser, make the luminous power of pump laser output expectation.
2, the gain adjusting method therefore of the reversed distributed raman amplifier of many pumpings according to claim 1 is characterized in that the described first step comprises:
Step 1: read the configured list among the ROM, obtain gain-adjusted reference value p0_s, work optical channel number N _ ch, turn off gain Configuration Values G_c, gain detection modified value p_n, fiber type TYPE and gain-pump power relation data P Ij, and with among the above-mentioned data importing RAM; If configured list is empty, then use the default value of above-mentioned each amount;
Step 2: control module processor control amplifier group and AD/DA change-over circuit are implemented flashlight detection, pump laser state-detection, obtain pump laser serviceability data f Ij, and calculate current demand signal output power p_s and current turn off gain G_s;
Step 3: according to configuration data and gain one pump laser power data P Ij, calculating optimum configuration output power p_c j
3, the gain adjusting method therefore of the reversed distributed raman amplifier of many pumpings according to claim 3 is characterized in that, described step 3 is calculated the best configuration output power P_c of pump laser j according to the following equation j:
P_c j=P Mj+ (G_c-G m) * (P Nj-P Mj)/(G n-G m); J=1 wherein ..., N, G_c are the gain Configuration Values, G m, G nBe the discrete gain values nearest, and satisfy G apart from G_c m＜G_c＜G n, P Mj, P NjBe to correspond respectively to turn off gain G m, G nThe performance number of laser instrument j.
4, the gain adjusting method therefore of the reversed distributed raman amplifier of many pumpings according to claim 1 and 2 is characterized in that, described the 4th step also comprises:
Judge | whether G_s-G_c|＜Δ is set up, and wherein G_s is the current gain value of the amplifier that obtained in the 3rd step, and Δ is a gain locking error allowance value; If set up, then satisfy the degree of regulation requirement; If be false, then get G_c '=2G_c-G_s, return the first step then, calculate one group of new laser power Configuration Values according to the gain Configuration Values G_c ' after upgrading.
5, the gain adjusting method therefore of the reversed distributed raman amplifier of many pumpings according to claim 4, it is characterized in that, described method comprises also at last whether inquiry control module processor needs and the equipment management system communication, if Query Result is empty, then return the first step, implement cycle performance and detect; If Query Result is not empty, then the control module processor carries out device talk by input/output interface, if the performance querying command is arranged, then reports according to performance data; If the configuration information querying command is arranged, then report according to allocation list; If the configuration data update command is arranged, then revise the configured list among the RAM, or important configuration data is kept at E 2Among the PROM, return the first step then, implement cycle performance and detect.
CNB021375615A 2002-10-15 2002-10-15 Gain controlling method for reversed distributed multipumping Raman amplifier Expired - Fee Related CN1317599C (en)

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